On Wed, Jan 07, 2015 at 02:27:10PM +0100, Thierry Reding wrote: > > Yeah. I plan to have the information of all the clock client of the > > partitions and > > the memory clients be defined statically in c source, e.g. pmc-tegra124.c. > > All modules can declare which domain they belong to in DT. One domain can > > be really power gated only when no module is awake. Note the clock clients > > of > > one domain might not equal to the clocks of the module. The reset is not > > either. > > So I don't get the clock and reset from module. How do you think? > > This whole situation is quite messy. The above sequence basically means > that drivers can't reset hardware modules because otherwise they might > race with the power domain code. It also means that we can't powergate The powerdomain framework won't call any powergating method as long as a module in the domain is still active. So as long as drivers don't try to reset the hw without having done a pm_runtime_get(), we shouldn't have such a race? > modules on demand because they might be in the same power domain as one > other module that's still busy. > The powerdomain framework keeps track of which modules are active (by hooking into runtime pm) and won't try to shutdown a domain unless all modules are inactive. > How would we handle a situation where a hardware module hangs and we can > only get it back via a reset? > Cheers, Peter. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
